Have me as your personal online trainer at http://myhitechtrainer.com/tihealthan... Tuan here once again with another vid on my training for All Nautral Federation Musclemania on June 2009 in Miami. Here I am giving a demo of what I have been doing for months to get my body ready cardio wise. Good olf fashion sprinting, 400 style baby. If anyone that has run track, and did the 400 as there race, you also know how grueling it is. But the benefits are amazing, at lesast for myself. I do a run/walk program, and each 400 meter I sprint, I like to shoot for under 80 sec. As for how long, I will do a minimum of 3 miles, and up to 5 on a long cardio day. However, by that time, my runs are more like 100 sec because I am very tired. Hope you enjoy the vid. PLEASE DO NOT TRY THIS IF YOU HAVE NOT HAVE PROPER TRAINING OR COACHING